Allergies are on the rise in industrialized nations because improved hygiene has eliminated the microbes that, upon exposure, prompt infants' allergy-iihWrjng immune-system responses. Any ill effects of the rise in allergies, however, have been more than offset by the reduction in infant mortality caused by the elimination of pathogens. Further, current research suggests that future atergy-prevention therapies will compensate for the absence of beneficial microbes.
The statements above, 4 true, most strongly support which of the following?
With globalization, companies often save on costs by paying lower wages abroad rather than by enhancing the abilities of their domestic workers, and this helps explain why productivity in many countries has been high over the last decade even as, despite year-to-year variation, domestic wages and job creation have barely grown.
Paleontologist: Dinosaurs belonged to two major taxonomic groups, the Saurischia and the Orlnithischia. Scientists have long known that the branch of the Saurischia from which birds are descended had primitive feathers. However, a recently discovered fossil of a previously unknown Orinithischia species also has feather-like structures. Thus, dinosaurs must have evolved feathers early in their history, before the Saurischia and Orinithischia diverged.
Which of the following is an assumption the paleontologist's argument requires?
A)
B)
C)
D)
E)
Plague bacilli, the microorganisms that cause bubonic plague, are typically carried from rodents to humans by fleas. Although the bubonic plague epidemic that devastated
Europe in the Middle Ages probably originated with certain species of plague-infected rodents from central Asia, the nomadic peoples of central Asia never contracted plague.
Therefore, since they undoubtedly had some contact with infected rodents, it is likely that these central Asian peoples had physiological immunity against plague bacilli.
Which of the following, if true, most seriously weakens the argument?
The passage mentions “high-frequency changes in inventory” (see bolded text) in order to
Government regulations in Nation X require that milk products labeled "organic" come from cows that have access to pasture. Many industrial dairies have begun using the organic label on their products even though their cows spend most of their milk-bearing lives confined to feed lots eating grain. Critics charge that industrial dairy cows spend too little time grazing in pastures for their milk to bear the organic label, but the cows' owners insist that the animals are in good health and show no signs of discontent.
Which of the following would it be most useful to establish in order to determine whether the industrial dairies' use of the organic label complies with government regulations?
Sizable amounts of ice on the moon could provide future moon dwellers with drinking water and, if they split the water into its atomic components, hydrogen for fuel and oxygen for air. For a decade, scientists have argued about whether there is Ice in the Shaddeton crater located at the moon's south pole. Radar signals reflected off the crater are consistent with one of two scenarios: either the crater contains ice or the crater has a highly rough surface. Many scientists believe that the Shackleton crater does contain ice because_________.
Which of the following, if true, most logically completes the argument above?
The first two sentences of the second paragraph serve primarily to
